What is the working principle of the flow meter?

The ultrasonic flowmeter adopts the time difference measurement principle: after one probe transmits the signal through the pipe wall, the medium, and the other side pipe wall, it is received by another probe, and at the same time, the second probe also transmits the signal and is received by the first probe. . Due to the influence of the medium flow rate, there is a time difference Δt between the two. According to the calculation, the conversion relationship between the flow rate V and the time difference Δt can be obtained V=(C2/2L)×Δt, and then the flow value Q can be obtained.

The working principle of the turbine flowmeter is the main type in the velocity flowmeter. When the measured fluid flows through the turbine flowmeter sensor, the impeller rotates under the action of the fluid, and its speed is proportional to the average flow velocity of the pipeline. At the same time, The blade periodically cuts the magnetic lines of force generated by the electromagnet and changes the magnetic flux of the coil. According to the principle of electromagnetic induction, a pulsating electric potential signal, that is, an electric pulse signal, is induced in the coil. The frequency of this electric pulse signal is proportional to the flow rate of the fluid being measured. Proportional.

The working principle of the open channel flowmeter is to use ultrasonic technology to measure the fluid level height, and then calculate the flow rate through the microprocessor inside the instrument. Due to the non-contact measurement, the open channel flowmeter can be used in harsher environments. The open channel flowmeter emits and receives ultrasonic waves under the control of a computer, and calculates the distance between the open channel flowmeter and the measured liquid level according to the transmission time, thereby obtaining the liquid level height. Because there is a certain proportional relationship between the liquid level and the flow rate, The liquid flow rate Q can be finally obtained according to the calculation formula.

The English name of the flowmeter is flowmeter, which is defined by the National Scientific and Technical Terms Review Committee as: a meter that indicates the measured flow rate and (or) the total amount of fluid in a selected time interval. Simply put, it is an instrument used to measure fluid flow in pipes or open channels. The unit m3/h is commonly used in engineering. It can be divided into instantaneous flow rate (Flow Rate) and cumulative flow (Total Flow). The instantaneous flow rate is the amount of effective cross-section of a closed pipe or open channel in a unit time. The material flowing through can be gas, Liquid, solid; cumulative flow is the cumulative amount of fluid flowing through the effective cross-section of a closed pipeline or open channel in a certain period of time (one day, one week, one month, one year). The cumulative flow can also be obtained by integrating the instantaneous flow with time, so the instantaneous flowmeter and the cumulative flowmeter can also be converted into each other.